The EMPIRICAL LABS DerrEsser ELDS-V 500-Series High-Frequency Fixerfrom EMPIRICAL LABS DerrEsser ELDS-V 500-Series High-Frequency Fixeris a vertical multi-function dynamic filtering device, designed for API 500-Series enclosures. In its basic DS mode, it is an effective, level-insensitive de-esser, a device that will adjust the high-frequency gain on overly treble-y or spiky vocals or other sources in an extremely musical manner. However, unlike other de-essers, the device allows for multiple uses of its circuitry. As a de-esser in the DS mode (HF Limit OFF), the threshold can be set to tame harsh S's (sibilants) that result from an overly bright singer or from EQ'ing to make a vocal sound aggressive and clear. The DS threshold is not level dependant, and compares the amount of high-frequency content to the low-frequency content, so adjusting the overall level does not affect the threshold. It features VCA technology for glitch-free, distortion-free, and noise-free performance. The corner frequency is user adjustable with a high-performance active crossover.

In HF Limit mode, the DerrEsser essentially acts as a high-frequency compressor. If there is enough high-frequency content to exceed the threshold, then gain reduction occurs. It is level sensitive, but responds much more to high frequencies. This mode is more of a general high-frequency smoothing device. In high-pass mode and while using the LISTEN function, the user can employ the filter circuitry inside the DerrEsser to process their audio. With the LISTEN button in, and the HP/LP switch out, the user will be hearing the high frequencies that are being controlled with the dynamic/compression circuits. The corner frequency is adjustable with the frequency knob. In low-pass mode and with the LISTEN button in, and the HP/LP button in, the user is now listening to the low frequencies, those not affected by the VCA and dynamic/compression circuits. This is a 12 dB-per-octave filter whose corner frequency can again be adjusted with the frequency knob.

High-Performance Desser    High-Frequency Limiting    Hard-Clip Indiator    True Bypass    Military-Grade Switches and Relays    Hand-Built and Calibrated in the USA

• High-frequency limiting with a tailored soft knee. The Dynamic Section can be used for de-essing or smooth high-frequency softening
• Hard-Clip Indicator Light: This Bad-Clip LED indicates when the sound level is within 1 dB of hard clipping and monitors several sections within the DerrEsser for possible clipping
• Unity Gain: 6 dB of gain on inputs and outputs available
• API-500 Series rack compatible
• True bypass
• Military-grade switches and relays
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Related Questions and Answers

Q: 1. Is this indicator fixer? Will it turn color when exhausted?

A: Unfortunately, no, the Ilford Rapid Fixer (Liquid,1 Liter) does not have indicator dye in the fixer. However, the Ilford Ilfostop Stop Bath (500ml), B&H # ILISB500ML, is a stop bath from Ilford that does have dye that is pH sensitive and changes color from yellow to purple as the stop bath becomes exhausted.

Q: 2. Any idea of how many 35mm 36x rolls this would last? Thanks.

A: As per Ilford, 24 rolls of 35mm film in 36 exposures can be processed at a 1+4 dilution

Q: 3. What wetting agent should I use with this fixer?

A: I use LFN. Never had any issues.

Q: 4. After the solution is mixed, how long is the shelf life? Also, how many times can a batch-size working volume be re-used?

A: Arista Arifix Powder Fixer (To Make 1 gal) will last about six months once mixed. If fixer smells like sulfur (rotten eggs) it is no longer useful, too much film has gone through the fixer.

Q: 5. do I have to rinse with water after using the fixer for a spiral canister?

A: You can re use fixer so after you fix your film pour into a container for re use. After you have used the fixer on your film it is safe to be in the light. But yes you should be washing your film after that step as well as using some sort of wetting agent for cleaner negatives. Hope that helped

Q: 6. How long is Ilford Rapid Fixer good in an unopened bottle?

A: STORAGE Full, unopened bottles of ILFORD RAPID FIXER concentrate stored in cool conditions, 5–20ºC (41–68ºF), will keep for two years. Once opened use completely within six months and keep all bottles tightly sealed until used.

Q: 7. Is this toxic or dangerous? I want to teach children how to develop photographs using the coffee method and it recommended to use this as a fixer.

A: Here's some guidelines to using fixer. All chemicals need to be used with caution, especially with children.Effects of ExposureGeneral advice:Contains: Sodium thiosulphate. The toxicological properties of this material have not been fully investigated and its handling and use may present additional hazards. Expected to be a low health hazard for recommended handling.Inhalation: Expected to be a low hazard for recommended handling. In contact with strong acids or if heated, sulphites may liberate sulphur dioxide gas. Sulphur dioxide gas is irritating to the respiratory tract. Some asthmatics or hypersensitive individuals may experience difficult breathing.Eyes: No specific hazard known. May cause transient irritation.Skin: This material has a low potential to cause allergic skin reactions; however, cases of human skin sensitization have been reported.Ingestion: May be harmful if swallowed. Some asthmatics or sulfite-sensitive individuals mayexperience wheezing, chest tightness, stomach upset, hives, faintness, weakness and diarrhea

Q: 8. Can I reuse the fixer for processing film?

A: Yes you can reuse it but it is recommended to replenish it. The instructions on that is on page 3 at this link, https://bit.ly/3MdKFI1 .

Q: 9. Does this have hardener in it?

A: No.

Q: 10. I have a Mac Studio. Can I control the volume on these speakers from my Mac keyboard as I can with my Logi speakers?

A: Yes, you can use the Mac volume keys on the keyboard to control the volume of the Creative Labs GigaWorks T40 Series II Speakers.